3 . A butterfly’s wings can have many jobs besides keeping the insect high up in the air. They may be used to attract mates, or to warn potential attackers to stay away. All of these roles, though, depend on their unchanging colouration. This plays into the idea that butterfly wings are dead tissue, like a bird’s feathers. In fact, that’s not true. For example, in some species males’ wings have special cells releasing some chemicals which attract females.

Nanfang Yu, a physicist at Columbia University, in New York, has been looking into the matter. Together with Naomi Pierce, a butterfly specialist at Harvard University, he has now shown, in a paper published in Nature Communications in February, 2020, that butterfly wings are, indeed, very much alive.

In their experiments, the two researchers used a laser(激光) to heat up spots on the wings of dozens of butterfly species. When the temperature of the area under the laser reached 40°C or so, the insects responded within seconds by doing things that stopped their wings heating up further. These actions included a butterfly turning around to minimize its profile to the laser, moving its wings up and down or simply walking away.

Butterflies engaged in all of these heat-minimising activities even when the researchers blindfolded them. That suggested the relevant sensors were on the wings themselves. Dr Yu and Dr Pierce therefore searched those wings for likely looking sensory cells. They found some, in the form of neurons(神经元) that were similar to heat detectors known from other insects. They also uncovered disc-shaped cells that appeared to be similar to pressure-sensitive neurons. They guess that these are there to detect deformation of the wing—information an insect could use to control its flight pattern.

The third discovery they made to contradict the “dead wing” idea was that some butterfly wings have a heartbeat. A butterfly’s wings have veins(静脉). These carry a bloodlike liquid which, researchers have now found in males, shows a pulse(脉搏) of several dozen beats per minute. The source of this pulse appears to be the scent(气味) pad, a dark spot on the wings that produces the female-attracting chemicals. Apparently, this “wing heart” acts as a pump that helps bloodlike liquid through the scent pad.

In all their experiments simulating different environmental conditions, Dr Yu and Dr Pierce consistently found that, different parts of the wing are covered by different sorts of scales(鳞屑). In particular, tubes pass through scales over the scent pads. This improves their ability to spread heat away and helps keep the living parts of a butterfly’s wings alive.

4 . Last year, the bushfires in Australia burned more than 12.35 million acres of land. At least 25 people were killed and 2000 homes destroyed. According to the BBC, that was the most casualties(伤亡) from wildfires in the country since 2009. The University of Sydney estimates that 480 million animals have died in South Wales alone.

Zeke Hausfather, an energy systems analyst and climate researcher at Berkeley Earth, said warmer temperatures and extreme weather made Australia more susceptible to fires and increased the length of the fire season. "The drier conditions combined with record high temperatures in 2019 created main conditions for the disastrous fires. Australia's fires were worsened by the combination of those two. 2019 was the perfect storm for being the warmest year on record for Australia and the driest year on record for Australia," Hausfather added on Friday.

Kevin Trenberth, a senior scientist at the US National Center for Atmospheric Research, said warmer ocean temperatures are also contributed to more variable weather around the world. Trenberth believes that global warming contributed to energy imbalances and hot spots in the oceans, which can create a wave in the atmosphere that locks weather patterns in places, causing longer rain events in Indonesia, for example, and at the same time contributing to drought in Australia. He said that once an area experiences drought conditions for two months or more, it increases the risk of fires catching and spreading. Those changing weather patterns due to global warming make drought events longer.

Climate experts stress that climate change is not the only factor in the severity(严重) of wildfires. How land is managed can also impact the amount of fuel available for fires. Practices like controlled bums and other factors can impact the risk to people and property, such as warning systems and the type of development in a given area. Changing those policies has great potential to limit future damage from wildfires along with changes to how fire management resources are dispatched(派遣).

5 . A shocking 53.6 million tons of electronic waste were discarded（丢弃）last year, a new UN-backed report has revealed. The report shows that e-waste is up 21%from five years ago. This isn't surprising, considering how many more people are adopting new technology and updating devices regularly to have the latest versions, but the report also shows that national collection and recycling strategies are nowhere close to matching consumption rates.

E-waste contains materials including copper（铜）, iron, gold and silver, which the report gives a conservative value of $ 57 billion. But most are thrown away or burned rather than being collected for recycling. Precious metals in waste are estimated to be worth $ 14 billion, but only $4 billion-worth is recovered at the moment.

While the number of countries with national e-waste policies has grown from 61 to 78 since 2014, there is little encouragement to obey and a mere 17% of collected items are recycled. If recycling does occur, it's often under dangerous conditions, such as burning circuit boards to recover copper, which "releases highly poisonous metals" and harms the health of workers.

The report found that Asia has the highest amounts of waste overall, producing 24.9 million metric tons (MMT), followed by Europe at 12 MMT, Africa at 2.9 MMT, and Oceania at 0.7 MMT.

But whose responsibility is it? Are governments in charge of setting up collection and recycling points, or should companies be responsible for recycling the goods they produce? It goes both ways. Companies do need to be held accountable by government regulations and have incentives to design products that are easily repaired. At the same time, governments need to make it easy for citizens to access collection points and deal with their broken electronics in a convenient way. Otherwise, they may turn to the easiest option-the landfill.

8 . In 2010, my mother-in-law gave me her rather simple but graceful, antique “secretary desk”. The desk easily fit into the tiny room at the top of the stairs. I felt so secure, and confident when I sat down and began each writing session. Despite the desk’s appeal, its limited storage capacity meant that I often put file folders and books on the small floor space around me. After each writing session, I painstakingly gathered the tools of the trade and placed them on a nearby shelf until the next session.

A few years into my writing journey, we moved into a bigger home and I acquired my own office. My husband, Bill offered on more than one occasion to buy me a new desk for my office, but I ignored his offer.

One day, we stopped at the local office supply store. Bill found what he thought was the perfect desk for me. “I want to buy this for you, sweetie. My writer needs a bigger desk. ”He hugged me.

“Thanks, but I don’t want a bigger desk!” I said.

“Why don’t you want a bigger desk?” he said. “You must be afraid of something.”

“I’m not afraid of anything,” I said. “Like I said, I really like my little desk. So don’t ask me again.”

He didn’t.

A few weeks later, while working in my new office. I looked around at the folders, books and papers lying all over my office floor but couldn’t find what needed to meet a contest deadline. My heart raced. I looked around my office. The room basically swallowed the tiny desk, making it look slightly out of place. Maybe I did need a bigger desk. Was Bill right? Was I afraid of something?

Unable to write, I pulled c. JoyBell C.’s book of poetry, All Things Dance Like Dragonflies (蜻蜓), from the bookshelf. I flipped through its pages, and her words about faith jumped off the page into my heart. She talked about how she had trained herself to love the feeling of not knowing where she was going, and just trusting that as she opened up her wings and flew off in an unknown direction, things would work out.

At that moment, I recognized that a bigger desk symbolized bigger possibilities, stepping out in faith, and leaving my comfort zone.

9 . Monthly Talks at London Canal Museum

Our monthly talks start at 19:30 on the first Thursday of each month except August. Admission is at normal charges and you don’t need to book. They end around 21:00.

November 7th

The Canal Pioneers, by Chris Lewis. James Brindley is recognized as one of the leading early canal engineers. He was also a major player in training others in the art of canal planning and building. Chris Lewis will explain how Brindley made such a positive contribution to the education of that group of early “civil engineers”.

December 5th

Ice for the Metropolis, by Malcolm Tucker. Well before the arrival of freezers, there was a demand for ice for food preservation and catering, Malcolm will explain the history of importing natural ice and the technology of building ice wells, and how London’s ice trade grew.

February 6th

An Update on the Cotsword Canals, by Liz Payne. The Stroudwater Canal is moving towards reopening. The Thames and Severn Canal will take a little longer. We will have a report on the present state of play.

March 6th

Eyots and Aits-Thames Islands, by Miranda Vickers. The Thames had many islands. Miranda has undertaken a review of all of them. She will tell us about those of greatest interest.

Online bookings:www.canalmuseum.org.uk/book

More into:www.canalmuseum.org.uk/whatson

London Canal Museum

12-13 New Wharf Road, London NI 9RT

www.canalmuseum.org.uk   www.canalmuseum.mobi

Tel:020 77130836

10 . Reading can be a social activity. Think of the people who belong to book groups. They choose books to read and then meet to discuss them. Now, the website Book Crossing.com turns the page on the traditional idea of a book group.

Members go on the site and register (登记) the books they own and would like to share. Book Crossing provides an identification number (识别码) to stick inside the book. Then the person leaves it in a public place, hoping that the book will have an adventure, traveling far and wide with each new reader who finds it.

Bruce Pederson, the managing director of Book Crossing, says, “The two things that change your life are the people you meet and books you read. Book Crossing combines both.”

Members leave books on park benches and buses, in train stations and coffee shops. Whoever finds their book will go to the site and record where they found it.

People who find a book can also leave a journal entry describing what they thought of it. E— mails are then sent to the BookCrossers to keep them updated about where their books have been found. Bruce Pederson says the idea is for people not to be selfish by keeping a book to gather dust on a shelf at home.

Book Crossing is part of a trend (趋势) among people who want to get back to the “real” and not the virtual (虚拟).The site now has more than one million members in more than one hundred thirty—five countries.